From 173c67948b22efd325e7ee7084b57acf25688078 Mon Sep 17 00:00:00 2001
From: David Craven <david@craven.ch>
Date: Thu, 30 Aug 2018 20:35:36 +0200
Subject: [PATCH] [RISCV] Disable atomics for riscv32imc-unknown-none-elf.

---
 src/librustc_target/spec/riscv32imc_unknown_none_elf.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/librustc_target/spec/riscv32imc_unknown_none_elf.rs b/src/librustc_target/spec/riscv32imc_unknown_none_elf.rs
index 15b16cf3101..68da1b61adf 100644
--- a/src/librustc_target/spec/riscv32imc_unknown_none_elf.rs
+++ b/src/librustc_target/spec/riscv32imc_unknown_none_elf.rs
@@ -27,7 +27,8 @@ pub fn target() -> TargetResult {
         options: TargetOptions {
             linker: Some("rust-lld".to_string()),
             cpu: "generic-rv32".to_string(),
-            max_atomic_width: Some(32),
+            // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86005
+            max_atomic_width: None, //Some(32),
             atomic_cas: false,
             features: "+m,+c".to_string(),
             executables: true,